Return-Path: Received: from mtain-da08.r1000.mx.aol.com (mtain-da08.r1000.mx.aol.com [172.29.64.80]) by air-mc05.mail.aol.com (v127_r1.1) with ESMTP id MAILINMC052-a9684b8e7cda188; Wed, 03 Mar 2010 10:14:34 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 43177380000EB; Wed, 3 Mar 2010 10:14:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmqFy-00073G-Si for rs_out_1@blacksheep.org; Wed, 03 Mar 2010 15:13:02 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmqFy-000737-GU for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:13:02 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmqFx-0007mF-GV for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:13:02 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id o23FCwTj027308 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 3 Mar 2010 16:12:58 +0100 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o23FD0MB013083 for ; Wed, 3 Mar 2010 16:13:00 +0100 Message-ID: <4B8E7D1A.8090403@iup.uni-heidelberg.de> Date: Wed, 03 Mar 2010 16:15:38 +0100 From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id o23FCwTj027308 X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: 9kHz: soundcard RX Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d40504b8e7cd4554b X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Horst, This is the soundcard: http://shop.zeg-shop.de/shop/index.asp?id=3D120340&sid=3D2670421779 It costs 8,99 Euro ;-) It is nothing special but the advantage is that it is not installed in my notebook. So it can be kept apart from the PC by a cable and there are possibilities for additional decoupling. But normally the noise of the RX and preamp should be higher so that the noise of the soundcard becomes irrelevant. But it is a way to check if an improvement can be achieved... 73, Stefan/DK7FC Am 03.03.2010 10:32, schrieb Horst St=C3=B6cker: >> And what about a simple band pass filter to supress the 50Hz and it's= harmonics? Necessary or dispensable? >> > You can hear (!) the difference. I just took a 10mH coil from Reichelt= to improve my soundcard-RX before one of the last SAQ activities. > > Despite of more or less excellent digital filtering of SpecLab it's a= good idea. One should not keep the soundcard busy with unwanted signals. > > What I am not sure about is the use of an audio transformer. It might= have some influence to the signal. As it just has to keep the soundcard= from beeing blown it might be a good idea to take a cheap soundcard inste= ad of the audio transformer - and maybe a second in spare. > > Stefan, what USB-soundcard you bought for 10 EUR ? > > Horst DO1KHS > ___________________________________________________________ > GRATIS f=C3=BCr alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! > Jetzt freischalten unter http://movieflat.web.de > >